2 EESTI STANDARDI EESSÕNA NATIONAL FOREWORD Käesolev Eesti standard EVS-EN :2005 sisaldab Euroopa standardi EN :2005 ingliskeelset teksti. Käesolev dokument on jõustatud ja selle kohta on avaldatud teade Eesti standardiorganisatsiooni ametlikus väljaandes. Standard on kättesaadav Eesti standardiorganisatsioonist. This Estonian standard EVS-EN :2005 consists of the English text of the European standard EN :2005. This document is endorsed on with the notification being published in the official publication of the Estonian national standardisation organisation. The standard is available from Estonian standardisation organisation. Käsitlusala: This Part 1-12 of EN details the test methods to determine the inductance characteristics of cables used in analogue and digital communication systems. It is to be read in conjunction with EN , which contains essential provisions for its application. Scope: This Part 1-12 of EN details the test methods to determine the inductance characteristics of cables used in analogue and digital communication systems. It is to be read in conjunction with EN , which contains essential provisions for its application. ICS Võtmesõnad: Standardite reprodutseerimis- ja levitamisõigus kuulub Eesti Standardikeskusele

3 EUROPEAN STANDARD EN NORME EUROPÉENNE EUROPÄISCHE NORM April 2005 ICS English version Communication cables - Specifications for test methods Part 1-12: Electrical test methods - Inductance Câbles de communication - Spécifications des méthodes d'essai Partie 1-12: Méthodes d'essais électriques - Inductance Kommunikationskabel - Spezifikationen für Prüfverfahren Teil 1-12: Elektrische Prüfverfahren - Induktivität This European Standard was approved by CENELEC on CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN :2005 E

4 EN : Foreword This European Standard was prepared by the CENELEC Technical Committee TC 46X, Communication cables. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN on The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) latest date by which the national standards conflicting with the EN have to be withdrawn (dow) This European Standard has been prepared under the European Mandate M/212 given to CENELEC by the European Commission and the European Free Trade Association.

6 EN : Scope This Part 1-12 of EN details the test methods to determine the inductance characteristics of cables used in analogue and digital communication systems. It is to be read in conjunction with EN , which contains essential provisions for its application. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN Communication cables Specifications for tests methods Part 1-1: Electrical test methods General requirements EN Communication cables Specifications for tests methods Part 1-2: Electrical test methods DC resistance EN Communication cables Specifications for tests methods Part 1-11: Electrical test methods Characteristic impedance, input impedance, return loss EN Communication cables Part 1-2: Definitions 3 Definitions For the purposes of this European Standard the definitions of EN apply in addition to the following ones. 3.1 inductance the inductance (L) of a pair (or with respect to the side of a quad) is the effective inductance of instrumentation cables. Inductance and mutual capacitance are parameters which describe the possibility of storing electrical energy in this kind of cables At any (low) frequency, the impedance of a cable can be represented by two components - resistance (R) and reactance (X) - or as a polar function having magnitude (Z) and phase (θ). The impedance may be represented by either a series or parallel circuit. For the series case R = Z * cos (θ) and X = Z * sin (θ) where Z = (R 2 + X 2 ) tan (θ) = X/R and for inductance X = 2 πfl Inductances have to be measured normally at low frequencies (50 Hz, 800 Hz or Hz) as required in the relevant cable specification. For this case the resistance (R) has to be measured as described in EN R is the DC-resistance of a pair (= loop resistance = the resistance of the two conductors of the pair) or a side of a quad.

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